try {
            DefaultSettingsBuildingRequest req = new DefaultSettingsBuildingRequest();
            req.setUserProperties(toProperties(session.getUserProperties()));
            req.setSystemProperties(toProperties(session.getSystemProperties()));
            if (request.getGlobalSettingsSource().isPresent()) {
                req.setGlobalSettingsSource(new MappedSettingsSource(

                if (!addEdge(from, p, problems)) {
                    return null;
                }

                ModelBuilderRequest req = ModelBuilderRequest.build(request, ModelSource.fromPath(p));

                try {
                    return defaultModelBuilder.readRawModel(req, problems);
                } catch (ModelBuilderException e) {
                    // gathered with problem collector
                }

                Path path = request.getPath().get();
                res = builder.build(path.toFile(), req);
            } else if (request.getSource().isPresent()) {
                Source source = request.getSource().get();
                ModelSource2 modelSource = new SourceWrapper(source);
                res = builder.build(modelSource, req);
            } else {
                throw new IllegalArgumentException("Invalid request");